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[Bug 1550468] [NEW] kernel: correct restore of high gprs on signal return

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From: Launchpad Bug Tracker <1550468@xxxxxxxxxxxxxxxxxx>
Date: Fri, 26 Feb 2016 18:52:26 -0000
Reply-to: Bug 1550468 <1550468@xxxxxxxxxxxxxxxxxx>
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== Comment: #0 - Hendrik Brueckner - 2016-02-26 11:02:00 ==
Please backport Linux kernel upstream commit ID:

commit 342300cc9cd3428bc6bfe5809bfcc1b9a0f06702
Author: Martin Schwidefsky <schwidefsky@xxxxxxxxxx>
Date:   Fri Feb 19 14:44:14 2016 +0100

    s390/compat: correct restore of high gprs on signal return
    
    git commit 8070361799ae1e3f4ef347bd10f0a508ac10acfb
    "s390: add support for vector extension"
    broke 31-bit compat processes in regard to signal handling.
    
    The restore_sigregs_ext32() function is used to restore the additional
    elements from the user space signal frame. Among the additional elements
    are the upper registers halves for 64-bit register support for 31-bit
    processes. The copy_from_user that is used to retrieve the high-gprs
    array from the user stack uses an incorrect length, 8 bytes instead of
    64 bytes. This causes incorrect upper register halves to get loaded.
    
    Cc: stable@xxxxxxxxxxxxxxx # 3.8+
    Signed-off-by: Martin Schwidefsky <schwidefsky@xxxxxxxxxx>

** Affects: linux (Ubuntu)
     Importance: Undecided
     Assignee: Skipper Bug Screeners (skipper-screen-team)
         Status: New


** Tags: architecture-s39064 bugnameltc-137990 severity-high targetmilestone-inin1604
-- 
kernel: correct restore of high gprs on signal return
https://bugs.launchpad.net/bugs/1550468
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